Solve for x
x=16
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9x+15+21=180
Combine 6x and 3x to get 9x.
9x+36=180
Add 15 and 21 to get 36.
9x=180-36
Subtract 36 from both sides.
9x=144
Subtract 36 from 180 to get 144.
x=\frac{144}{9}
Divide both sides by 9.
x=16
Divide 144 by 9 to get 16.
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